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The world's best gem articles, published weekly.

Most Recent Articles

Boracite Value, Price, and Jewelry Information

With light blue and green colors, no cleavage, and high hardness, boracite is an uncommon mineral. Unfortunately for jewelry lovers, faceted boracites are very rare.

How to Spot a Fake Diamond: What These 13 Tests Really Mean!

Not sure what your gem is? Try these 13 at-home tests to spot a fake diamond — and learn what these tests really mean. Or, take it to a lab to be 100% sure!

Lapidary Technology Through the Ages: Laps and Polish

Early lapidary technology doesn’t differ from our modern tools as much as you might think. Learn more about the history of laps, polish, and gem cutting.

Emerald & Asscher-Cut Diamonds: Evaluating Quality

The mesmerizing patterns of emerald & asscher-cut diamonds can give engagement rings a subtle style. Learn how to find a quality diamond within your budget!

Scheelite Value, Price, and Jewelry Information

Large, faceted scheelites are among the most beautiful of all collector’s gemstones. They occur in many colors and fluoresce very brightly. If cut properly, scheelites can have tremendous fire.

Ten Big, Beautiful, and Affordable Engagement Ring Stones

Looking for a gem that will make a big impression on your finger, not your wallet? These ten gems make great options for affordable engagement ring stones.

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"Becoming a Pro Member of IGS just made good sense for my business. The gemology resources are fantastic, and my profile lets potential customers know I am serious about colored gemstones. And frankly, if I get any exposure to potential customers it's a no-brainer."
Paul Bierker, Paul Michael Designs
Jeweler, IGS Pro Member

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Over 15 years, we have assembled detailed pricing and value information for appraising over 70 different gemstones. The values in our guide come from a variety of sources including primary and secondary gemstone dealers, jewelers, miners, and wholesale suppliers of commonly traded gemstones.

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